In the Parable of the Sower (Matthew 13:1-23), what does the seed that falls on rocky ground primarily represent in terms of initial reception of the word?

A Those who hear the word and immediately produce a great harvest. B Those who hear the word and endure persecution for its sake. C Those who hear the word and receive it with joy, but fall away when trouble or persecution comes because they have no root. D Those who do not understand the word and are easily misled by the evil one.